Kelvin Hall in Glasgow has been officially reopened by First Minister Nicola Sturgeon after a major £35m refurbishment.

The venue has been transformed into one of the UK's biggest museums and research centres.

The major project was a collaboration between Glasgow City Council, Glasgow Life, Glasgow University and the National Library of Scotland.

About half of the building is now back in use after the refurbishment, funded by Glasgow City Council, Glasgow University, the National Library of Scotland, Scottish Government, Heritage Lottery Fund and Historic Environment Scotland.

Kelvin Hall now boasts a state-of-the-art health and fitness centre and a vast collections' centre of museum artefacts.

It also houses the National Library of Scotland's extensive digital resources held within its collections.

The interactive space will give visitors the chance to explore films, maps, books and manuscripts in electronic format, as well as being able to enjoy events and talks previously only available in Edinburgh.

Kelvin Hall is the new home for the Library's Moving Image Archive, which contains thousands of films and videos capturing over 100 years of Scotland's history, as well as specialist facilities for the university and Glasgow Museum.

First Minister Nicola Sturgeon said: "I am delighted to officially reopen the first phase of the redevelopment of Kelvin Hall.

"Having seen a variety of uses in its 90-year history, the Kelvin Hall is now home to some of Glasgow's finest cultural attractions, housing the National Library of Scotland's Scottish Screen Archive and hosting the hidden treasures of the Hunterian and Glasgow Museums collections.

"And it's fitting that following the huge success of Glasgow 2014, one of Scotland's biggest health and fitness centres in now open at the Kelvin Hall."

She said the Scottish Government would dedicate a further £2m to the second redevelopment phase.

Glasgow City Council leader Frank McAveety said: "Everyone has their own memory of the Kelvin Hall and I'm delighted that we have been able to breathe new life into this much-loved building.

"Working with our partners, we have transformed this building into an inspirational cultural and sporting complex of international scale and quality.

"The people of Glasgow are already enjoying the facilities - and with plans for a further redevelopment of the remainder of the building, there's so much more still to come."

Glasgow University principal Professor Anton Muscatelli said: "Today marks a momentous day in the history of Kelvin Hall.

"The multipurpose venue provides an exceptional addition to what the university is able to offer our community.

"Students attending our new and innovative courses at Kelvin Hall will benefit immensely from a unique way of learning."

Mr McAveety said students and researchers would have access to 1.5 million objects belonging to the Hunterian Museum, the Glasgow Museums collection and the National Library of Scotland's moving image archive under one roof.

He added: "Kelvin Hall will allow the University of Glasgow to build on its international reputation for world changing, collection-based research and teaching.

" It will enable us to forge new academic and educational partnerships and practices."

Dr John Scally, of the National Library, said: "Kelvin Hall has been reborn and we are delighted to be an important part of this exciting new development.

"The National Library at Kelvin Hall offers access to the riches held within our collection to people in the west of Scotland for the first time."

Dame Seona Reid, of the Heritage Lottery Fund's Scotland committee, said the building's renovation was an "example to the rest of the UK of how sport, learning and heritage can thrive together".

She added: "Glasgow should be justly proud."

The Hunterian museum will move into the building during the second phase of the refurbishment of the Category B listed building.

Further work will be carried out to enhance the art spaces and displays, and the city's Charles Rennie Mackintosh artefacts will be shared with the public

There will also be enhancements to the National Library of Scotland's Moving Image Archive, events and civic spaces and the Royal Highland Fusiliers Museum will connect with the space.

Glasgow City Council has approved investment plans worth £8.2m at Kelvin Hall, to secure the roof of the remainder of the building and further improvements to other undeveloped areas of the building.

The council will contribute a total of £6.2m to this work, with the other £2m coming from the Scottish Government.